Following the same logic: everyone who isn't a Native American doesn't count as American.

And how are you going to count someone with one Swiss parent and one immigrant parent? Three Swiss grandparents and one immigrant grandparent? What are you going to do about all those people in Genève who had a forefather move over from Annecy 5 generations ago?

The fact that most Swiss people speak languages pretty damn close to German, French, and Italian should be a good indication that immigration does, in fact, create Swiss people.